Invalid gemspec in [/usr/lib/ruby/gems/1.8/specifications/activemodel-3.2.0.gemspec]: Illformed requirement ["#<YAML::Syck::DefaultKey:0xb5f9c990> 3.2.0"]
From trying to do a sudo gem update for other issues
getting this hundreds of time as sudo gem update goes through each gem and gets the message for most of them
This can happen when upgrading to Rails 3.2.
Updating Rubygems should fix this issue.
gem update --system
Hope this helps.